Selective clacxtit-ciroseb



J.'P.`WAHLSTROM.

SELECTIVE CIRCUIT CLOSER.

Avrucmon mso 0016x1911.

1 327f505, Patented Jan; 6,1920.

115.5 ffy. ,e

l "f M 36' .sa '15 s! .s6

" 11 'L t J5; l w16 C A t; 16'

sav/@CD "D 6. qu 16 f4 s l. cn #La a 0 i O 7 Y a' j Y f (invento: cvZ/n/ I? Wafzlram,"

ff/2M @ma u,

Patented Jan. 6,1920.

2 SHEETS-SHEET 2.

4 m. n.. i I /f UNITED STATES PATENT OFFICE. u

JOHN r. WAnLsTnoM, or Mrmmuoms, MnmEsoTA.

SLECTIVE CIRCUIT-CLOSER.

l .spe'mwign or Letten munt.

Patented Jan. 6, 1920.

Y Cheers; o which thezfollowing is a'speci fication.

" This inventiony relates `to circuit-closets flor' useparticularly 'in automatic lire alarms, and more especially to thosevhaving fusible elements? thermally: operated; and lone fob ject' of th'efsame'E 1s te 'prduce'fa' device of this" character ghaving thermalE jelements which maybe selectivelyveinployed bythe userso' as to: causethe circuit to ine-'auto'- maticall closed-utY either al relativel low de of heat.' u

i *other object is to 'provide-:improved means for permitting'replacem'erit'fof the cartridge. r f e f 'f Other objects will appear in the following specification which ycontains a' detailed de scription '-of thel preferred construction of this circuit' closer, reference 'heg to the drawings wherein-4 lfFigure '1 is affront elevation of the conA plete `'apparatus Aset lwith lthe-terminals 4-out of .contact'and heldin that position byzboth thermal elements. v

Fig.` 2' isfa similar elevationwith' the arts in position showingfthe termina1s=e osed,

an enlarged scale' showing the supporting bracket to which'one end of the fuse is -attached and a fastening screw rthrough -its other end. Q j The numeral 1 designates a besef'which may be a block of wood, or of pomelain, fiber, or the like, about three inches square, and which is to he to a wall or other upright support by any suitable means not necessary to illustrate.' 'I have shown binding-posts 2 and -neai' the lowerl end of this base, and wires lead- 'from:them, and when thisdevice-isa asa circuitcloser n- Lanfautomatic fin? alarm lsystem, these will -lead throughs source'of electric energy -to an annulicintor hvinglalnmlppro, priate'ldrop'to designate them'. artfnetfin througlim bell or otherwhich is actutedftolsoundan-alamiat lthe time thelcir-V cit' is 'closesif @Howeverg details. ofthe wiringr'andftheisignalzln forn zio; art o-.the'pre'sent-invention and-rare ore not..illustrat ed'-I= have? spoken ofthe :same merely` the" intende'dnse' to: which this circuit clsersis-ito be' put.`.:fImay say here-that ithe'circuitcloserl is set .upt'mr an apartmengn hotel 'lrodm''orf'an cice, t-:is desirablefthat it shall'/ctfto' elosefthe alarm ireuit 'at :a relativelyl'ow .temperhire such as 180 Ff; whereas 1f the ideviceis set upin a boiler room :foffinstenceandswhere .the temperature lis always'highendt be set so 'as to act at a srelatiively'high temperature as 155f1.; t feature of theinvention'l is 'the stru. refofxthe instrument which 'ermit's the@ rater tofset it for 'action' ectively at-'ei erlow :or high temperature, Abut of cours'e'always-at a temperature considerably? above.-norxnal and which willnever Abe' reached I'unless a fire should occur.: v No iwlpuit choice the operator makes.; -Inos't ofr-the elements of the structurefarezn 7Iise..: Eromthe.' ost 2 a. strip: 4' rises to and *'electncal connection with a plate -lit-.whichcarries the cartridge holder best seen'in-Fig. 5, and .also ea'rriesa forwardly projecting rigid pin 6 which: constiliutes one ofthe. termjnals`.- On

the plete below the iniis'a screw y'If-which projects forward, an on this screw is loosely mounted the head 8 o'f-a tubularT-shaped element, held removabl j and ad'usta ly thereon by a nut 9 on t e forwar -end of .the screw. The stem-10 of said element constitutes a socket for receiving a fusible cartridge, the latter 'consisting of a wooden plug 11 of ay size tofe'nter the socket; and a soft outer-end 12 made up of a. mixture of soep stone, pumice-stbne, vund wax or equiva lent binder-the composition being suoli that it will melt or become softened at about 130 F. When in active position as seen in Fig. 1, the stein 10 stands horizontally and is so held by tightening the nut 9, and the cartridge will not of coui'sefall out of the socket; but when the nut is loosened the cartridge holder assunies position best seen in Fig. 2, the used cartridge drops out and a new one may be inserted and the device reset at aili-` tiiile;

From the post 3 rises a strip 14 extending past the plate 5 and connected a't its upper end with a right-.angular plate 15 whose outwardly piojecting leaf is secured to one arm of an inverted ULShaped spring 16, the other arm of the spring depending to, a point where its expansion throws it into normal Contact with theouter end of the cartridge, and the front edge of this arm is preferably notched as shown at 17. The lowerr end of the outer leaf` of spring 16 `is bent into a horizontal lip 18, and pivotedbeneath .the saine at 19 is one end of ythe other termina126 whose rear ede is preferably provided with anotch 27 as est seen in`F1gi 3 andwhose free end overlies. the terminal V6 .but may only contact tlieiewith when the two notches 17 and 27 register. For drawin -theedge of the terminal 26 toward the ront edge of the free arinof the spring 16,11 spring is emplgred; and while I may use any a prov' -form offspring, I have shown t e same herein in the shape of a long leaf 20, provided on its upper end is a bracket 21 mounted on the base, and having its lower end bent forward. and reduced in the form of a ngei" 22 which enters a hole or eye 23 in the terminal 26all as best seen in Fig'. el.' The tendency of this lea-f spring is to swing the terminal inward on its pivot 19 andV throw'its free end into contact with the terminal 6, and this tendency is resisted by the contact of the -rear edge of the terminal 26 with the bottom of the notch 17 in the spring 16, whereas said leaf spring is permitted to close the circuit when the two notches register as stated above. One device for holding the notches out of register is the fusible eartrid e when carried by its holder as seen in i 1 because this cartridge is of such lengt that it holds the Ulspringlt compressed slightly so that the notches cannot register. "Secured tothe face of the base is a 'bracket to,A and.' centrally.- voiezi ai 31 in .sind

' bracket-lisa rock ever'Bi, its lower end adapted'tocolntact with the free arm of-the main s .ringf'at a. poitfjust above the notch't'erein.' The numeral -desig'nates another bracket, and' 34 is a fuse whose Aextremities arefrem'ovably connected by screws 35 ind fwith the bracket '33 and the u per end'of the rook lever 32 respectively. `his fuse is of `soft metal or a composition of metals, or it may be made of two pieces of metal overlapped and soldered together by fusible material as best seen in lFig. 6. At anf rate, it is intended to melt or become so tened or parted by the strain thrown upon it, when a temperature of 155 F. is reached. Obviously the fuse may be replaced by another, by withdrawing the screws 35 and 36 and inserting them thiou h the eyesa'tthe ends of the new `insel-and viously the fuse can be thrown entirely out of use by withdrawing one of said screws and turning or swinging theV fuse aside on the other screw.

. Fig'.'.1 shows both thermal elements iii use. and the parts ofY the device set. When the teni rature rises to 130 the cartridge will me t' but the main spring is et held. compressed by the rook leveii ien the temperature reaches 1559 the fuse will melt and. the expansion,- Q the main spring permits-its free arm to move to the left so that its' notch 'comes into register with the notch in the terminal? 'yund the spriii 20 draws 'on the latter to, throw itsfree en into contact with the terminal 6, and this closing of the circuit-.inay'periorm any desired service. When it is desired tofhave the instrument act at the' higher temperature it 'may be well to either remove the cartridge or swing the cartridge holder aside. 'When it is desired to have the 4in'struininit a'ct at the lower temperature, the screw. at one extremity of the fuse will be removed and the fuse turned aside, Whereas thel cartridge must be used. Therefore-the device permits the' operator acertain. choice in selection 'of the temper utul'e at which he wishes the circuit closed, andthis in addition to the fact that he might have yet softer ,01' more easily fused cai-- tridges-and yet harder or less easily melted fuses so as to am lfy the rango of teni ieratures within w ich the circuit wool he closed. Having once' acted, the device is reset-iii an. obvious manner.

I claim:

1, I n a selective ciiout closer, the conibnation with iiiied and movable teriiiinals, a spring throwing" tl ien-i' normally into contact, an element which in one position prevents the action of saidspringyof thermal niembers hisi-ble at di''eret temperatures, means for turning one into ,contact with the element to hld it insaid' ,position` a rook lever, a; bucket, and means for connectingthe other element fivithsad bracket-and rock the .lever to hold one arm-of the latter iii Contact with the element and hold-thc elemerit iii-said poaitioin A ...'2.' Ina selectii'e'cirouit closer; the combination. with lined hind vn i'ovalolfe terininals. u

taot, an element which in one position prefnsezsos vents the action of said spring, Yoffra cai`- tridge fusible at one temperature,a `intenable holder for supportingzthe cartridge with one endzin contact.withthel element tohold it in said position 'wheiidesiredgarcentnally ivoted rock lever havingvon'e iendin contact with the element, and azuseftusibl at another temperature and adapted to connect the other end-losaidleverwith a fixed point at will, for the purpose set torth.

3. In a selective circuit closer, the combination with a fixed terminal, a movable terminal pivoted at one end to the support and having a notch in its rear edge, a spring drawing its free end normally toward the fixed terminal, and a spring retainer whose free arm stands behind the movable terminal; of thermal members fusible at different temperatures, and means for throwing them selectively or jointly into connection with said free arm to hold it out of register with said notch.

4. In a selective circuit closer, the combination with a Iixed terminal, a movable terminal pivoted at one end to the support and having a notch in its rear edge, a s ring drawing its free end normally towar the tixed terminal, and a spring retainer whose free arm stands behind the movable terminal; of a thermal member fusible at one temperature, means for turning it into contact with the free end of said arm when desired, a second thermal member fusible at another temperature, a pivoted lever whose tip bears on said arm, and means for connectin this lever with a fixed point by said secon member when desired, the use of either or both members holdin said arm out ot registry with the notch in t e movable terminal.

5. In a selective circuit closer, the combination with a base, and a fixed terminal carried thereby, a rigid angular member mounted on the base and having an outwardly projecting leaf, of a U-shaped spring having one arm attachedto said leaf and its lower end bent into a horizontal lip, a movable terminal pivoted at one end to said lip and having a notch at its rear edge, and a spring bearing its free end normally toward the fixed terminal but supported therefrom by the tree arm ot the U-shaped spring and located behind the pivoted terminal across the same, said free arm provided in its front edge with a notch at the point of crossing, the depth of the two notches being such that when they register the terminals may contact, a thermal member fusible at one temperature, means for throwing it into contact with the lower end of the free arm of said U-shaped spring when desired to hold said notches out of registry, a rock lever having one end contacting with said arm above the movable terminal, a second thermal member fusible Vat another temperature, Vand means Vfor connectin lthis member-with axed pointand sai lever when desired to holdtheflever in position to also holdisaid :notches-.cut tot registry.` Y'. gseirenit closer, the combinationwith terminal carried thereby, a vrigid-1angular member mounted `on they base and haringen outwardly projecting'leaf, of a U-shaped spring having one arm attached to said leaf and its lower end bent into a horizontal lip, a movable terminal pivoted at one end to said lip and having a notch at its rear edge, a spring bearing its free end normally toward the fixed terminal but supported therefrom by the free arm of the U-shaped spring, which stands behind the pivoted terminal across the same, said free arm provided in its front edge with a notch at the point of crossing, the depth ot the two notches being such that when they register the terminals may contact, thermal members fusible at different temperatures, and means for selectively throwing them into use to hold said notches out of register.

7 In a circuit closer, the combination with a base, a fixed terminal carried thereby, a rigid angular member mounted on the base and having an outwardly projecting leaf, of a U-shaped spring hav ing one arm attached to said leaf and its lower end bent into a horizontal lip, a movable terminal pivoted at one end to said lip and having a notch at its rear edge, and a spring bearing its free end normally toward the fixed terminal but supported therefrom by the free arm of the U-shaped spring, which stands behind the pivoted terminal across the same, said free arm provided in its front edge with a notch at the point ot' crossing, the depth of the two notches beingr lsuch that when they register the terminals may contact, a screw projecting from said base and having a nut, a holder movably mounted on thc screw beneath this nut, and a fusible fluo' removably inserted in the holder an4 adapted by thc turning of the latter to be set in contact with the free end of said arm to hold said notches out of registry.

8. In a circuit closer, the combination with a base, a fixed terminal carried thereby. a screw also carried thereby. a nut on the screw, a movable terminal having one end pivotally connected with the base, a spring tending to swing its free end normally into contact with the fixed terminal, and a spring attached to the base and having an arm passing behind the movable terminal, this terminal and arm having notches in their contacting edges which when in register permit. the terminals to contact; of a T-shaped tubular holder whose head is mounted on seid screw under its nut, and a. fusible car- Lemmon movabl; muuntng its head on sadbase, and a iusib o cartr ge removably crrid i111 it's stem andi adapted to be tumed into ooasac with said element to hohl it out o normal position andrto; hol' the terminals out of con'- af'et withoach other.

In esmny whereof E affix my Signatura.

JOHN P. WAHLSTBM; 

